yupeng9 opened a new issue #7036:
URL: https://github.com/apache/incubator-pinot/issues/7036


   There are senairos that users need to run complex adhoc queries (e.g. 
multi-way join with other datasets) or ETL jobs that scan all Pinot segments. 
Pinot servers are not designed this pattern of workloads. And even we allow 
this type of scan over the segments, such queries can significant degrade 
server performance and affect other important online queries.
   
   As an alternative, compute frameworks like Presto and Spark can directly 
scan the segments stored on Pinot's deep store like HDFS or S3, if there is a 
segment reader available. 


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